Abstract: Using the enclosure experiment，sediment nutrient release rule in shallow area of reservoir was studied under the simulated natural condition，the relationship between the sediment nutrient release and the algae growth was also analyzed． The results showed that sediment nutrients in shallow area of reservoir started to release on the tenth day and the release peak occurred on the seventeenth day． Meanwhile，the sediment nutrient release can accelerate algae growth． Original overlying water with lower concentration can accelerate the release of sediment nutrient and the outbreak of algae，comparing with higher concentration overlying water． Ｒaining could also accelerate the sediment nutrient release and the growth of algae，especially green algae． Before the algal bloom，pH and dissolved oxygen would raise and show the peak．